"One account per member of the community". No problems.
Let's suppose that a member writes two posts daily on his/hers account. The first one uses the #silvergoldstackers tag and is about precious metals. He is upvoted and gains one Precious Gem. The second article, hours later, is about anything and it doesn't use the tag. According to what you wrote in the article above, this second post would use the Precious Gem and would be upvoted too. That way the member would receive two upvotes daily, using the same account.
Am I wrong?
@buggedout